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The Bradley effect, less commonly called the Wilder effect, is a theory proposed to explain observed discrepancies between voter opinion polls and election outcomes in some US government elections where a white candidate and a non-white candidate run against each other. The theory proposes that some voters tend to tell pollsters that they are undecided or likely to vote for a black candidate, and yet, on election day, vote for his white opponent. It was named after Tom Bradley, an African-American who lost the 1982 California governor's race despite being ahead in voter polls going into the elections.